Sand-grinder.



SAND GRINDER. APPLICATI'ION FILED FEB. 16, 1909.

Patented Feb. 1,1910.

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GUSTAV REINI-IOLD BILZ, OF NEW YORK, N. Y., ASSIGNOR T RUDOLF MILLER, 0F MASPETH, NEW YORK.

SAND-GRINDER.

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Specification of Letters Patent.

Application filed February 16, 1909. Serial No. 478,311

Patented Feb. 1, 191d.

To all whom it may concern: wall 12 has an adjustable plate 15 at its Be it known that I, GUSTAV It. Binz, a lower end portion slidable up and down and citizen of the United States, residing in secured by bolt 16, to vary its engagement New York city, in the county of New York with the periphery of the wheel, and the 5 and State of New York, have invented oer, wheel is rotated so that it will engage this tain new and useful Improvements in Sandadjustable plate as the wires move out of Grinders, of which the following is a specithe receptacle. The opposite wall 14.- is fication. preferably slightly bent at 16 where it en- The object of this invention is to provide gages the periphery of the wire brush. Also 10 an improved apparatus for grinding sand the bottom portions 17 and 18 of the sides or like material, especially the fine sand used 15 and 13, are slightly bent where they enfor forming molds for casting metals, in gage the side of the periphery of the brush. which apparatus the grinding member, in In the operation of the device, the sand or the nature of a brush of wire or other mateother material is placed in the receptacle,

15 rial, will engage the sand and force it and will at once fall against the periphery against a plate, and the sand will be driven of the wheel, that is rotated at ahigh speed from the brush by centrifugal force; and and in the direction shown by the arrow. practically pulverized or reduced to a very This will considerably agitate the sand and line state. press it against the adjustable plate 15,

20 In the drawings representing an embodiwhereby the sand will be engaged by the ment of my invention, Figure 1 shows a extremities of the wires, that will be thrown front elevation with the receptacle in secoutward and kept taut by the centrifugal tion; and Fig. 2 is a side elevation with the action. By engagement between the adj ustreceptacle in section. able plate and the wires, the sand will be 25 The invention comprises essentially a rebroken up into very fine particles, and as ceptacle having an opening in its lower part, the wires pass beyond this plate and free of into which extends a rotary grinding memthe receptacle, the sand will be thrown off her, in the nature of a. circular brush that tangentially by centrifugal force, as indipractically fills the opening. On a suitable cated by the broken lines 20 in Fig. 2. By

30 pedestal P, are bearings 3 and 4, in which this means the sand or other material will rotates a shaft 5, having fast and loose pulbe reduced to very fine particles in a very leys 6 and 7 thereon, whereby the shaft can short time and without much expenditure be driven by a belt 8. On this shaft is seof power. As the plate 15. engaged by the cured a rotary or circular grinding member wires to effect the grinding operation, be-

35 9, that preferably has its grinding surface comes worn the plate is advanced into enformed by wires, in other words is a circugagement with the wheel from time to time. lar wire brush, and preferably very fine Obviously when considerably worn the plate wire is used. A receptacle 10 is suitably can be substituted by another. carried on the machine, and shown as se- Having thus described my invention, I

40 cured to a bracket 11, extending up from the claim: pedestal. The receptacle has an opening in 1. In combination, a receptacle co1nprisits lower portion, into which extends the ing four substantially upright members inwire brush 9, that closes the opening. The closing av rectangle, a rotatably supported receptacle is shown as formed by four vercylindrical wire brush forming the bottom 15 tical walls or plates 12, 13, 14- and 15, that member of the receptacle, the two sides of form a rectangle in horizontal section. The the wire brush being in engagement with receptacle has no bottom member, but is. two opposite sides of the receptacle, the diplaced over the wire brush 9 so that the ameter of the brush being slightly greater brush completely closes the bottom and enthan the width of the other two sides of the so gages the four side walls of the receptacle; receptacle whereby the brush can extend a the diameter of the brush being slightly considerable distance into the receptacle and greater than the distance between the oppoin engagement with the extremities of such l site walls engaging the periphery of the two sides, one of said latter sides being exl brush, as shown in Fig. 2. One of the walls tended beyond the receptacle into engage- 55 engaging the periphery of the brush, as the ment w1th the wire brush.

2. In combination, a receptacle comprising four substantially upright members inclosing a rectangle, a rotatably supported cylindrical wire brush forming the bottom member of the receptacle, the two sides of the wire brush being in engagement with two opposite sides of the receptacle, the diameter of the brush being slightly greater than the width of the other tWo sides of the receptacle whereby the brush can extend a considerable distance into the receptacle and in engagement with the extremities of such two sides, one of said latter sides being extended beyond the receptacle into engagement with the wire brush, said latter side having its engaging portion adjustable in the direction of said side.

GUSTAV REINHOLD BILZ.

lVitnesses FRED. J. DOLE, WILLIAM H. R1111). 

